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How long does sildenafil last?

Duration, factors & what to expect

Dr. James Mitchell, PharmD

Lead Pharmacist · Updated May 2025

Medically reviewed

Sildenafil typically lasts 4–6 hours, though individual response varies considerably. Here’s everything you need to know about timing, duration, and how to get the best results.

Typical duration by dose

The standard duration of sildenafil is 4–6 hours, but this varies by dose and individual.
Dose Typical duration Notes
25mg 3–4 hours Shorter duration, suitable for sensitive patients
50mg 4–5 hours Common starting dose
100mg 4–6 hours Standard dose, most men
150mg 5–7 hours Longer potential duration
200mg 6–8 hours Maximum dose — not recommended as first choice

What affects how long sildenafil lasts

Several factors influence duration:

• Food: A high-fat meal before taking sildenafil delays absorption and can reduce peak concentration, shortening effective duration.
• Age: Older men may experience longer duration as drug clearance slows with age.
• Alcohol: Moderate alcohol doesn’t significantly affect duration, but heavy drinking reduces effectiveness overall.
• Metabolism: Individual metabolic rate affects how quickly sildenafil is processed.

When to take sildenafil for best results

Take sildenafil 30–60 minutes before planned sexual activity. For fastest onset, take it on an empty stomach or after a light, low-fat meal. The drug is active for 4–6 hours — sexual stimulation is required for it to work during this window.

Tip: If you’ve been disappointed by sildenafil “not working,” the most common reason is incorrect timing or taking it after a heavy meal. Try taking it 45–60 minutes before activity on an empty stomach.

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Dr. James Mitchell, PharmD, MBA

Lead Pharmacist · Reviewed May 2025

This article is reviewed by a licensed pharmacist and updated regularly. For personalised medical advice, please consult your own healthcare provider before starting any new medication.

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